Calculation of Short Circuit Current for Drilling Platform's Electric Power System

The power system short circuit of the drilling platform is caused by insulation damage and misoperation, etc. If the short circuit occurs in the main switchboard's bus (or trunk), there will be a short circuit current that is many times larger than normal current, it generates mechanical stress and thermal effect that leads to the damage of the generator and other electrical equipment. It will also cause the grid voltage to he greatly reduced and affect the electric equipment, thus endanger the safety of life and drilling platform facilities. The paper will make the analysis about the short circuit current principle, calculation method and estimation method for drilling platform power system, and compare the several different calculation methods. According to the characteristic of complex structure of the power system, this paper proposes a simple and effective short circuit current calculation method.